Apparatus for detecting malfunction of relay
First Claim
1. An apparatus for detecting a malfunction of a relay, which detects the malfunction of the relay connected to a direct current (DC) link capacitor so as to block an overcurrent being generated when an operation of an inverter system starts, comprising:
- a temperature determination unit configured to determine whether a relay resistor is overheated as a first determination result based on a resistance temperature value of the relay resistor being connected to the relay;
a charging voltage determination unit configured to determine whether a variation value of a charging voltage of the DC link capacitor according to the operation start of the inverter system exceeds a reference variation value as a second determination result; and
a relay malfunction determination unit configured to determine whether the relay is malfunctioned based on the first and second determination results, wherein a malfunction is determined when the relay resistor is overheated and the variation value of the charging voltage exceeds the reference variation value.
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Accused Products
Abstract
The present disclosure relates to an apparatus for detecting malfunction of a relay, which includes a temperature determination unit configured to determine whether or not a relay resistor is overheated based on a resistance temperature of the relay resistor being connected to a relay; a charging voltage determination unit configured to determine whether or not a variation value of a charging voltage of a direct current (DC) link capacitor according to an operation start of an inverter system exceeds a reference variation value; and a relay malfunction determination unit configured to determine whether or not the relay is malfunctioned based on one or more the determination results whether or not the relay resistor is overheated and whether or not the variation value exceeds the reference variation value.
17 Citations
14 Claims
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1. An apparatus for detecting a malfunction of a relay, which detects the malfunction of the relay connected to a direct current (DC) link capacitor so as to block an overcurrent being generated when an operation of an inverter system starts, comprising:
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a temperature determination unit configured to determine whether a relay resistor is overheated as a first determination result based on a resistance temperature value of the relay resistor being connected to the relay; a charging voltage determination unit configured to determine whether a variation value of a charging voltage of the DC link capacitor according to the operation start of the inverter system exceeds a reference variation value as a second determination result; and a relay malfunction determination unit configured to determine whether the relay is malfunctioned based on the first and second determination results, wherein a malfunction is determined when the relay resistor is overheated and the variation value of the charging voltage exceeds the reference variation value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An inverting system, comprising:
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a converter unit configured to convert alternating current power from the electric supply into direct current power; a direct current link unit configured to store the direct current power converted from the converter unit; an inverter unit configured to convert the direct current power from the direct current link unit into the alternating current power; a relay connected to a direct current link capacitor to block an overcurrent; and a malfunction detecting apparatus which detects a malfunction of the relay connected to a direct current (DC) link capacitor so as to block an overcurrent being generated when an operation of an inverter system starts, including; a temperature determination unit configured to determine whether a relay resistor is overheated as a first determination result based on a resistance temperature value of the relay resistor being connected to the relay; a charging voltage determination unit configured to determine whether a variation value of a charging voltage of the DC link capacitor according to the operation start of the inverter system exceeds a reference variation value as a second determination result; and a relay malfunction determination unit configured to determine whether the relay is malfunctioned based on the first and second determination results, wherein a malfunction is determined when the relay resistor is overheated and the variation value of the charging voltage exceeds the reference variation value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification